SpaceX's (SPCX) demand post-IPO proves to Paul Marino that Wall Street has a huge appetite for new, innovative companies. He points to ETFs exposed to SpaceX his firm has and highlights strong demand trends backing the IPO launch. Slyvia Jablonski sees similar traction in ETFs her company offers. She explains how the Elon Musk-led stock is just the latest of many showing a growing trend of single-name leveraged ETFs.